Curious facts about cosmic life and their inhabitants.

The precise chemical composition of these very alien lakes and seas remained unknown until 2014, when Cassini's radar instrument detected Ligeia Mare, now known to be Titan's second-largest hydrocarbon-filled lake. Ligeia Mare is brimming with an abundance of sloshing methane, and this enormous liquid reservoir is approximately the same size as two of Earth's Great Lakes combined--Lake Michigan and Lake Huron. Many planetary scientists think that the seabed of Ligeia Mare may be blanketed with a thick layer of sludge that is composed of organic-rich compounds.

and here is another

Organic dust forms when organic molecules, resulting from the interaction of sunlight with methane, grow large enough to tumble down to the surface of Titan. Dr. Roderiguez continued to explain that, even though this is the first-ever observation of a dust storm on Titan, the discovery is not especially surprising.

and finally

Similarly, in Norse mythology, Mani is the male personification of the Moon. Mani wanders across the sky in a horse and carriage, perpetually pursued by the Great Wolf Hati who catches him at Ragnarok--which is the "Twilight of the Gods," and the end of everything, in Norse mythology--that is, until it all begins anew.

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Brilliant, icy short-period comets invade the bright and toasty inner Solar System, far from their frozen domain in the Kuiper Belt. The Kuiper Belt is the reservoir of comet nuclei that is located closest to Earth. Short-period comets rampage into the inner Solar System more frequently than every 200 years. The more distant long-period comets streak into the inner Solar System's melting warmth and comforting light every 200 years--at least--from the Oort Cloud. Because Earth dwells closer to the Kuiper Belt than to the Oort Cloud, short-period comets are much more frequent invaders, and have played a more important part in Earth's history than their long-period kin. Nevertheless, Kuiper Belt Objects (KBOs) are sufficiently small, distant, and dim to have escaped the reach of our scientific technology until 1992.

Indeed, the mixture of nitrogen and methane that whirl around in Titan's swirling thick golden-orange atmosphere create a variety of organic compounds. It has been suggested that the heaviest materials float down to the surface of this hydrocarbon-slashed moon. When these organic compounds tumble down into Titan's lakes and seas--either by raining down from the clouds in alien showers of hydrocarbons, or by traveling along with Titan's strange rivers--some are dissolved in the liquid methane. The compounds that manage to survive this ordeal, and do not dissolve (such as nitrites and benzene), float down to the alien sea floors of this oddball moon-world.

However, the models become somewhat more complicated when different forms of ice are taken into consideration. The ice floating around in a glass of water is termed Ice I. Ice I is the least dense form of ice, and it is lighter than water. However, at high pressures, like those that exist in crushingly deep subsurface oceans like Ganymede's, the ice crystal structures evolve into something considerably more compact. "It's like finding a better arrangement of shoes in your luggage--the ice molecules become packed together more tightly," Dr. Vance said in his May 1, 2014 statement. Indeed, the ice can become so extremely dense that it is actually heavier than water--and therefore somersaults down to the bottom of the sea. The heaviest, densiest ice of all is believed to exist within Ganymede, and it is called Ice VI.